package com.pingao.mp.handle;

import com.auth0.jwt.JWT;
import com.auth0.jwt.JWTVerifier;
import com.auth0.jwt.algorithms.Algorithm;
import com.auth0.jwt.exceptions.JWTDecodeException;
import com.auth0.jwt.exceptions.JWTVerificationException;
import com.pingao.mp.config.jwt.PassToken;
import com.pingao.mp.config.jwt.UserLoginToken;
import com.pingao.mp.modular.sys.entity.User;
import com.pingao.mp.modular.sys.service.MenuService;
import com.pingao.mp.modular.sys.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.lang.reflect.Method;

public class AuthenticationInterceptor implements HandlerInterceptor {
    @Autowired
    UserService userService;

    @Autowired
    MenuService menuService;

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) {
        String token = request.getHeader("token");// 从 http 请求头中取出 token
        // 如果不是映射到方法直接通过
        if (!(handler instanceof HandlerMethod)) {
            return true;
        }
        HandlerMethod handlerMethod = (HandlerMethod) handler;
        Method method = handlerMethod.getMethod();
        //检查是否有passtoken注释，有则跳过认证
        if (method.isAnnotationPresent(PassToken.class)) {
            PassToken passToken = method.getAnnotation(PassToken.class);
            if (passToken.required()) {
                return true;
            }
        }
        //检查有没有需要用户权限的注解
        if (method.isAnnotationPresent(UserLoginToken.class)) {
            UserLoginToken userLoginToken = method.getAnnotation(UserLoginToken.class);
            if (userLoginToken.required()) {
                // 执行认证
                if (token == null) {
                    throw new RuntimeException("无token，请登录401");
                }
                // 获取 token 中的 user id
                String userId;
                try {
                    userId = JWT.decode(token).getAudience().get(0);
                } catch (JWTDecodeException j) {
                    throw new RuntimeException("登录失效，请重新登录401");
                }
                User user = userService.getById(userId);
                if (user == null) {
                    throw new RuntimeException("用户不存在，请检查用户和密码是否正确401");
                }
                // 验证 token
                JWTVerifier jwtVerifier = JWT.require(Algorithm.HMAC256(user.getPassword())).build();
                try {
                    jwtVerifier.verify(token);
//                    判断权限
//                    String servletPath = request.getServletPath();
//                    if (!servletPath.contains("/login")) {
//                        String permissions = request.getHeader("permissions");// 从 http 请求头中取出 permissions
//                        String decryptKaiser = KaisaUtil.decryptKaiser(permissions);
//                        List<String> list = JSON.parseArray(decryptKaiser, String.class);
//                        if (!list.contains(servletPath)) {
//                            throw new RuntimeException("您没有权限访问该接口402");
//                        }
//                    }
                } catch (JWTVerificationException e) {
                    throw new RuntimeException("登录失效，请重新登录401");
                }
                return true;
            }
        }
        return true;
    }
}
